NSString編碼轉換

  常有編碼方式有很多種,現在列出之間的轉換方式

NSString To UFT-8

[cpp] 
NSString *str2 =@"深"; 
const char * s = [str2 UTF8String]; 
     出現類似這樣格式的字段"\\U6df1\\U5733\\U56fd\\U5f00\\U884c01\\U673a\\U623",通常為Unicode碼,轉換測試函數為

[cpp] 
- (NSString *)replaceUnicode:(NSString *)unicodeStr {   
    NSString *tempStr1 = [unicodeStr stringByReplacingOccurrencesOfString:@"\\u" withString:@"\\U"];   
    NSString *tempStr2 = [tempStr1 stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""];   
    NSString *tempStr3 = [[@"\"" stringByAppendingString:tempStr2] stringByAppendingString:@"\""];   
    NSData *tempData = [tempStr3 dataUsingEncoding:NSUTF8StringEncoding];   
    NSString* returnStr = [NSPropertyListSerialization propertyListFromData:tempData   
                                                           mutabilityOption:NSPropertyListImmutable    
                                                                     format:NULL   
                                                           errorDescription:NULL];   
     
    return [returnStr stringByReplacingOccurrencesOfString:@"\\r\\n" withString:@"\n"];   
}   
    出現類似這樣格式的字段"深圳银行",通常為GBK碼,轉換方式為
[cpp] 
NSURL *url = [NSURL URLWithString:str2]; 
    NSData *responseData = [NSData dataWithContentsOfURL:url]; 
    NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000); 
    NSString *responseString = [[NSString alloc] initWithData:responseData encoding:enc];